Steel for hub bearing and manufacturing method of steel

A wheel bearing and molten steel technology, applied in the direction of metal rolling, etc., can solve the problems of low fatigue life, no requirements for metallographic structure, low requirements for non-metallic inclusions, etc., and achieve the effect of high contact fatigue life

Active Publication Date: 2019-04-26
JIANGSU LIHUAI IRON AND STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the steel for hub bearings that has been adopted in China can meet the above requirements, but this steel

Method used

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  • Steel for hub bearing and manufacturing method of steel
  • Steel for hub bearing and manufacturing method of steel
  • Steel for hub bearing and manufacturing method of steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The present embodiment adopts following production process to prepare:

[0065] 1) Hot metal pretreatment:

[0066] Using the KR desulfurization method, the molten iron is stirred in the molten iron ladle to form a vortex, and the desulfurizer is put into the vortex to fully react with the sulfur in the molten iron. Hot metal S≤0.003%;

[0067] 2) Converter smelting:

[0068] It is smelted in a top-bottom combined blown converter with a capacity of more than 100 tons. The primary smelting is carried out with molten iron and high-quality scrap steel as raw materials to achieve pre-removal of P. Lime, synthetic refining slag and various high-purity alloys are added to the steel for pre-deoxidation and initial composition. Adjustment, use sliding plate for composite slag blocking to ensure no slag tapping and prevent back to P;

[0069] 3) Refining:

[0070] Deep deoxidation and alloying of molten steel are carried out in an LF furnace of more than 100 tons, and refini...

Embodiment 2

[0082] The present embodiment adopts following production process to prepare:

[0083] 1) Hot metal pretreatment:

[0084] Using the KR desulfurization method, the molten iron is stirred in the molten iron ladle to form a vortex, and the desulfurizer is put into the vortex to fully react with the sulfur in the molten iron. Hot metal S≤0.003%;

[0085] 2) Converter smelting:

[0086] It is smelted in a top-bottom combined blown converter with a capacity of more than 100 tons. The primary smelting is carried out with molten iron and high-quality scrap steel as raw materials to achieve pre-removal of P. Lime, synthetic refining slag and various high-purity alloys are added to the steel for pre-deoxidation and initial composition. Adjustment, use sliding plate for composite slag blocking to ensure no slag tapping and prevent back to P;

[0087] 3) Refining:

[0088] Deep deoxidation and alloying of molten steel are carried out in an LF furnace with a capacity of more than 100 ...

Embodiment 3

[0100] The present embodiment adopts following production process to prepare:

[0101] 1) Hot metal pretreatment:

[0102] Using the KR desulfurization method, the molten iron is stirred in the molten iron ladle to form a vortex, and the desulfurizer is put into the vortex to fully react with the sulfur in the molten iron. Hot metal S≤0.003%;

[0103] 2) Converter smelting:

[0104] It is smelted in a top-bottom combined blown converter with a capacity of more than 100 tons. The primary smelting is carried out with molten iron and high-quality scrap steel as raw materials to achieve pre-removal of P. Lime, synthetic refining slag and various high-purity alloys are added to the steel for pre-deoxidation and initial composition. Adjustment, use sliding plate for composite slag blocking to ensure no slag tapping and prevent back to P;

[0105] 3) Refining:

[0106] Deep deoxidation and alloying of molten steel are carried out in an LF furnace of more than 100 tons, and refini...

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Abstract

The invention discloses steel for a hub bearing. The steel for the hub bearing comprises chemical components, by mass percent, including 0.54%-0.58% of C, 0.20%-0.30% of Si, 0.65%-0.75% of Mn, 0.10%-0.20% of Cr, 0.010%-0.030% of Al, 0.015% or less of P, 0.003% or less of S, 0.0025% or less of Ti, 0.20% or less of Ni, 0.15% or less of Cu, 0.10% or less of Mo, 0.0010% or less of [O] and the balanceFe. From the components of the steel for the hub bearing, alloying is carried out through conventional alloy elements such as the C, the Mn and the Cr, the contact fatigue life of the steel for the hub bearing is longer in performance than G55 in national (Carbon Bearing Steel) (GB/T28417-2012) standard.

Description

technical field [0001] The invention relates to a special alloy steel in the iron and steel industry, in particular to a steel for hub bearings and a manufacturing method thereof. Background technique [0002] The automobile industry is known as the pillar of the national economy due to its strong industrial linkage and technological absorption. The automobile industry is usually regarded as a symbol of the overall level of the country's manufacturing industry and technological innovation capabilities, and a manifestation of the country's comprehensive competitiveness. [0003] The stage of rapid economic development in Europe, the United States, Japan, South Korea and other developed countries is accompanied by the rapid development of the automobile industry. As a pillar industry in developed countries, the automobile industry is the main source of added value and capital formation in the manufacturing industry. It has driven the development of many related industries and...

Claims

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Application Information

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IPC IPC(8): C21C7/064C21C7/10C22C33/04C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50B21B1/46
CPCB21B1/463C21C7/064C21C7/10C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50
Inventor 左辉翟万里张洪才郑力宁肖波印传磊石可伟王子健
Owner JIANGSU LIHUAI IRON AND STEEL CO LTD
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